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T Herder · 07-23-2006, 09:01 PM

Howdy,
I'm new to the board but have been running these trucks for over thirty years.
Check the exhaust valves, some of these motors have sodium filled valves with hardened valve seats, you want those for unleaded fuel. The top end oiling is fed from the rear main camshaft bearing, it has a partial groove around its circumference, have the groove machined all the way around. Have close tolerance valve guides installed, if nothing else do this, the valve guides wear and the performance drops. If you can get them use the pistons with four rings and follow the factory original spacing and clearances. Install a five pass radiator, you'll think your temp gauge is broken, don't care how hot it is or what you do, it won't overheat.
Best regards,
Butch
----
65 3/4T 4x4, fuel injected 305E V6, SM 420, Gear Vendors, NP 205, BFG 35's on Weld SS, and some other stuff.

07-23-2006, 09:01 PM	#19
T Herder Registered User Join Date: Jul 2006 Location: San Jose, CA. Posts: 37	Re: GMC V6 engine compression ratio Howdy, I'm new to the board but have been running these trucks for over thirty years. Check the exhaust valves, some of these motors have sodium filled valves with hardened valve seats, you want those for unleaded fuel. The top end oiling is fed from the rear main camshaft bearing, it has a partial groove around its circumference, have the groove machined all the way around. Have close tolerance valve guides installed, if nothing else do this, the valve guides wear and the performance drops. If you can get them use the pistons with four rings and follow the factory original spacing and clearances. Install a five pass radiator, you'll think your temp gauge is broken, don't care how hot it is or what you do, it won't overheat. Best regards, Butch ---- 65 3/4T 4x4, fuel injected 305E V6, SM 420, Gear Vendors, NP 205, BFG 35's on Weld SS, and some other stuff.